CODEWITHSUNDEEP
python-3.x
Nicholas Gulli
Nicholas Gulli

Reputation: 9

How do i multiply a variable by a variable?

weight = print(int(input('weight: ')))
height = print (float(input('height: ')))

BMI = weight * height
print(BMI)

#i get this back
Traceback (most recent call last):
  File "C:/Users/Nicholas/Desktop/csp 17/Assign 3-2.py", line 4, in <module>
    BMI = weight * height
TypeError: unsupported operand type(s) for *: 'NoneType' and 'NoneType'

Upvotes: 0

Views: 39

Answers (1)

sacuL
sacuL

Reputation: 51395

print does just that: it prints things to your screen. Because it is a function that doesn't return anything else, it will implicitely return None.

You can verify this with a list comprehension if you want:

>>> x = [print(i) for i in range(5)]
0
1
2
3
4
>>> x
[None, None, None, None, None]

Notice that everything is printed, but the resulting variable is a list full of Nones.

For your code, try without the print, because what you're trying to do is not print those things, but assign the variables weight and height to the inputed value:

weight = int(input('weight: '))
height = float(input('height: '))

BMI = weight * height
print(BMI)

Upvotes: 3

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